<p>Granular materials are widely used in civil engineering infrastructures. However, they are prone to segregation, particularly due to vibration, during production, transport, and placement. This study presents a systematic quantification of vibratory-induced segregation using controlled laboratory tests on a vibrating table. Two crushed stones aggregate types differing in mineralogical composition and particle morphology (grain shapes), were evaluated across twelve gradations, derived from the specifications of Transport Quebec. All tests were conducted in a dry state to isolate the effect of grain size distribution and shape. The degree of segregation was quantitatively assessed using Relative Segregation Index (RSI). Results show distinct correlations between RSI and the coefficient of curvature (<i>C</i>_c). For continuous gradations, RSI exhibited a positive correlation with <i>C</i>_<i>c</i>, whereas for gap-graded gradations, an inverse relationship was observed. The <i>D</i>₁₅/<i>D</i>₈₅ criterion proved to be relevant for identifying weakly segregating materials. Furthermore, sub-rounded materials systematically exhibited more marked segregation than sub-angular materials, highlighting the determining effect of morphology. Small variations in certain granular fractions (5–1.25&#xa0;mm and &lt; 80&#xa0;μm) led to significant changes in the RSI, confirming the high sensitivity of the material to minimal granulometric deviations. These observations highlight the importance of rigorous control of granular characteristics to limit segregation in real conditions.</p>